NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 Dropped {multi|broad}cast of type= [86dd] NOHZ: local_softirq_pending 08 INFO: task syz-executor.0:478 blocked for more than 140 seconds. Not tainted 4.14.172-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29280 478 7445 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1f6/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x45/0xa0 kernel/locking/rwsem.c:26 iterate_supers+0xd6/0x240 fs/super.c:611 sys_sync+0x78/0x130 fs/sync.c:113 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c479 RSP: 002b:00007fd373ee3c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fd373ee46d4 RCX: 000000000045c479 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000ba5 R14: 00000000004ca63b R15: 000000000076bf2c INFO: task syz-executor.0:485 blocked for more than 140 seconds. Not tainted 4.14.172-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28256 485 7445 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1f6/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x45/0xa0 kernel/locking/rwsem.c:26 iterate_supers+0xd6/0x240 fs/super.c:611 sys_sync+0x78/0x130 fs/sync.c:113 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c479 RSP: 002b:00007fd373ec2c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fd373ec36d4 RCX: 000000000045c479 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000ba5 R14: 00000000004ca63b R15: 000000000076bfcc Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 2 locks held by getty/7404: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 2 locks held by getty/7405: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 2 locks held by getty/7406: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 2 locks held by getty/7407: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 2 locks held by getty/7408: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 2 locks held by getty/7409: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 2 locks held by getty/7410: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/478: #0: (&type->s_umount_key#67){++++}, at: [] iterate_supers+0xd6/0x240 fs/super.c:611 1 lock held by syz-executor.0/485: #0: (&type->s_umount_key#67){++++}, at: [] iterate_supers+0xd6/0x240 fs/super.c:611 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 4.14.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e2/0xb80 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16889 Comm: syz-executor.4 Not tainted 4.14.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88804eb32500 task.stack: ffff88804e8c0000 RIP: 0010:find_held_lock+0xea/0x110 kernel/locking/lockdep.c:3622 RSP: 0018:ffff88804e8c7630 EFLAGS: 00000097 RAX: ffff88804eb32da8 RBX: 1ffff11009d18ecf RCX: ffff88804e8c7698 RDX: 0000000000000004 RSI: ffffffff87d843e0 RDI: ffff88804eb32db8 RBP: ffffffff87d843e0 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88804eb32da8 R11: ffff88804eb32500 R12: ffff88804eb32da8 R13: ffffffff87d843e0 R14: ffff88804e8c7698 R15: 0000000000000001 FS: 00007f5e703c8700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c432dc9eb0 CR3: 00000000a41eb000 CR4: 00000000001406e0 DR0: 2000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000002 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_release kernel/locking/lockdep.c:3763 [inline] lock_release+0x237/0x7f0 kernel/locking/lockdep.c:4013 rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:685 [inline] find_get_entry+0x244/0x690 mm/filemap.c:1392 pagecache_get_page+0x44/0xa10 mm/filemap.c:1465 find_get_page_flags include/linux/pagemap.h:282 [inline] __find_get_block_slow fs/buffer.c:214 [inline] __find_get_block fs/buffer.c:1357 [inline] __find_get_block+0x45f/0xbf0 fs/buffer.c:1351 __getblk_slow fs/buffer.c:1100 [inline] __getblk_gfp+0x17e/0x7c0 fs/buffer.c:1383 __bread_gfp+0x29/0x290 fs/buffer.c:1417 sb_bread include/linux/buffer_head.h:307 [inline] udf_tread+0xe1/0x130 fs/udf/misc.c:44 udf_read_tagged+0x3a/0x4a0 fs/udf/misc.c:210 udf_check_anchor_block+0x188/0x530 fs/udf/super.c:1810 udf_scan_anchors+0x321/0x530 fs/udf/super.c:1872 udf_find_anchor fs/udf/super.c:1907 [inline] udf_load_vrs+0x582/0xa80 fs/udf/super.c:1972 udf_fill_super+0x715/0x14f6 fs/udf/super.c:2164 mount_bdev+0x2bc/0x370 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c479 RSP: 002b:00007f5e703c7c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5e703c86d4 RCX: 000000000045c479 RDX: 00000000200002c0 RSI: 0000000020000280 RDI: 0000000020000200 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000074a R14: 00000000004c9d34 R15: 000000000076bf2c Code: 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 11 5b 45 89 3e 4c 89 e0 5d <41> 5c 41 5d 41 5e 41 5f c3 4c 89 f7 e8 b5 24 3e 00 eb e5 e8 1e